# Universal A2A & MCP Tool Discovery, Safe-Proxy & Swarm Router

> Universal A2A & MCP Tool Discovery, Safe-Proxy & Swarm Router is a paid API for AI agents from github-audit.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-28).

Searches and discovers capabilities across 500+ MCP servers and A2A tools via a single meta-router endpoint with token compression and prompt firewall

## Facts

- Endpoint: GET https://github-audit.agentdiet.dev/v1/mcp-gateway?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Provider: github-audit.agentdiet.dev
- Website: https://github-audit.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/github-audit-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-f958d5ff
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DjtpmyFs4bvDl9c8OfTbr

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability github-audit-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-f958d5ff
```

Example prompt: Search the MCP gateway index for tools that handle 'GitHub security audits' and return the top 10 matching servers so I can pick the right one to use.

## When to prefer this

Use this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool handles a specific capability at runtime, rather than hardcoding tool lists. Particularly useful for multi-agent swarms that need to route tasks to specialized tools, or when you want a single connection point that proxies across 500+ tools with built-in prompt injection protection.

## Known failure modes

- Empty results if the query does not match any indexed capability
- Invalid cursor returns pagination error
- Query string too short (minLength 1) returns validation error
- Payment required (HTTP 402) if x402 payment not attached
- Rate limiting if too many queries in quick succession

## How this service works

Single-connection meta-router indexing 500+ MCP servers & A2A tools with 85% token compression and Prompt-Guard firewall. (Live x402 v2, IETF MPP & MCP endpoint at https://github-audit.agentdiet.dev/v1/mcp-gateway)

## Output

A paginated list of matching MCP servers and A2A tools, including metadata about each tool's capabilities, endpoint URLs, and relevance to the search query. Supports cursor-based pagination for large result sets.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "query"
 ],
 "properties": {
  "limit": {
   "type": "integer",
   "default": 20,
   "maximum": 100,
   "minimum": 1,
   "description": "Maximum number of items to return per page (1-100)"
  },
  "query": {
   "type": "string",
   "minLength": 1,
   "description": "Capability search query (e.g. 'context compression', 'github security', 'sec filings', 'company enrichment') or endpoint URL to verify"
  },
  "cursor": {
   "type": "string",
   "description": "Opaque pagination cursor for fetching the next page"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/github-audit-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-f958d5ff/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from github-audit.agentdiet.dev](https://www.zero.xyz/host/github-audit.agentdiet.dev/llms.txt)